Oral irrigator



FIG. 1 is a front, top perspective view of an oral irrigator, showing my new design;

FIG. 2 is a rear, bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines in the figures illustrate portions of the oral irrigator that form no part of the claimed design. 

CLAIM The ornamental design for an oral irrigator, as shown and described. 